Ultraviolet lamp with minimized ozone generation

Abstract

This application discloses an ultraviolet lamp with minimized ozone generation, the ultraviolet lamp comprising an outer tube; an inner tube arranged across the interior of the outer tube; an outer electrode installed on the outside wall of the outer tube; and an inner electrode installed on the inner side of the tube; wherein the outer electrode is in surface contact with the outside wall of the outer tube; and the width of the contact surface between the outer electrode and the outer tube is equal to the width of the effective electric field generated between the outer electrode and the inner electrode. Thus, because there is no discharge area between the outer electrode and the outer tube, when the outer electrode is connected to a high voltage, there is no discharge in the air, and no ozone is generated.

What is claimed is: 
     
         1 . An ultraviolet lamp comprising an outer tube, an inner tube arranged across interior of the outer tube, an outer electrode installed on outside wall of the outer tube, and an inner electrode installed on inner side of the inner tube, wherein the outer electrode is in surface contact with the outside wall of the outer tube; and wherein width of the contact surface between the outer electrode and the outer tube is equal to width of an effective electric field generated between the outer electrode and the inner electrode; and when the outer electrode is connected to a high voltage, no sparks will be generated between the outer electrode and the outer tube, thus avoiding or reducing generation of ozone. 
     
     
         2 . The ultraviolet lamp of  claim 1 , wherein the outer electrode is a metal wire being wound around the outside wall of the outer tube. 
     
     
         3 . The ultraviolet lamp of  claim 2 , wherein the metal wire has a triangular prism structure having a cross section in a triangular shape and three flat surfaces along longitudinal direction of the wire. 
     
     
         4 . The ultraviolet lamp of  claim 3 , wherein one of the three flat surfaces along cross the longitudinal direction of the metal wire is the contact surface of the metal wire with the outside wall of the outer tube. 
     
     
         5 . The ultraviolet lamp of  claim 2 , wherein the metal wire has a semi-cylindrial structure having a cross section in a semi-circle shape and a flat surface along longitudinal direction of the wire. 
     
     
         6 . The ultraviolet lamp of  claim 5 , wherein the flat surface along the longitudinal direction of the wire is the contact surface of the metal wire with the outside wall of the outer tube. 
     
     
         7 . The ultraviolet lamp of  claim 2 , wherein the metal wire has a semi-elliptical cylindrial structure having a cross section in a semi-elliptical shape and a flat surface along longitudinal direction of the wire. 
     
     
         8 . The ultraviolet lamp of  claim 7 , wherein the flat surface along the longitudinal direction of the wire is the contact surface of the metal wire with the outside wall of the outer tube. 
     
     
         9 . The ultraviolet lamp of  claim 1 , wherein the outer electrode is a conductive glue printed on the outside wall of the outer tube. 
     
     
         10 . The ultraviolet lamp of  claim 1 , wherein the outer electrode is a silver glue printed on the outside wall of the outer tube.